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All good answers. There is another possibility, that a clamp is leaking. Porsche uses a spring clamp, but has issued a TSB to replace these with conventional screw-type worm clamps whenever any of the originals are removed for service work. You're gonna need to get under it to see what more you can find.
If you continue to drive the car w/o addressing it, whatever the problem is could leave you stranded.
While it certainly could be the reservoir, especially w/ a '99. Porsche has since changed the type of plastic being used and it's much rarer on the later cars. If that's what it turns out to be, be certain you get the revised replacement tank. I believe the most current one is PN#996.147.106.07. Good Luck!
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